Mix equal amounts of white vinegar and warm water in a spray bottle.
Spray the calcium chloride stains with the vinegar and water mixture. Let the mixture remain on the calcium chloride stain for two to three minutes.
Blot the calcium chloride stain with a towel to pick up the vinegar, water and briny water.
Continue spraying the stain with white vinegar and water and blotting with a towel until the calcium chloride is no longer visible on the hardwood floor.
Wet a microfiber cloth with warm water and wring it out. Wipe the floor with the damp cloth to remove white vinegar residue. Dry the hardwood floor immediately with a soft, dry cloth.